CVE-2026-25075 | strongSwan up to 6.0.4 TTLS AVP Parser length integer underflow

VDB-352574 · CVE-2026-25075 · GCVE-0-2026-25075 STRONGSWAN UP TO 6.0.4 TTLS AVP PARSER LENGTH INTEGER UNDERFLOW HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.3 $0-$5k 2.49+ Summaryinfo A vulnerability described as problematic has been identified in strongSwan up to 6.0.4. This affects an unknown part of the component TTLS AVP Parser. Such manipulation of the argument length leads to integer underflow. This vulnerability is traded as CVE-2026-25075. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is recommended. Detailsinfo A vulnerability was found in strongSwan up to 6.0.4. It has been rated as problematic. Affected by this issue is an unknown code block of the component TTLS AVP Parser. The manipulation of the argument length with an unknown input leads to a integer underflow vulnerability. Using CWE to declare the problem leads to CWE-191. The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result. Impacted is availability. CVE summarizes: strongSwan versions 4.5.0 prior to 6.0.5 contain an integer underflow vulnerability in the EAP-TTLS AVP parser that allows unauthenticated remote attackers to cause a denial of service by sending crafted AVP data with invalid length fields during IKEv2 authentication. Attackers can exploit the failure to validate AVP length fields before subtraction to trigger excessive memory allocation or NULL pointer dereference, crashing the charon IKE daemon. The weakness was shared by Kazuma Matsumoto. The advisory is available at strongswan.org. This vulnerability is handled as CVE-2026-25075 since 01/28/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. Upgrading to version 6.0.5 eliminates this vulnerability. Productinfo Type Network Encryption Software Name strongSwan Version 6.0.0 6.0.1 6.0.2 6.0.3 6.0.4 License open-source CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 6.4 VulDB Meta Temp Score: 6.3 VulDB Base Score: 5.3 VulDB Temp Score: 5.1 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 7.5 CNA Vector (VulnCheck): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Integer underflow CWE: CWE-191 / CWE-189 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: strongSwan 6.0.5 Timelineinfo 01/28/2026 CVE reserved 03/23/2026 +54 days Advisory disclosed 03/23/2026 +0 days VulDB entry created 03/23/2026 +0 days VulDB entry last update Sourcesinfo Advisory: strongswan.org Researcher: Kazuma Matsumoto Status: Confirmed CVE: CVE-2026-25075 (🔒) GCVE (CVE): GCVE-0-2026-25075 GCVE (VulDB): GCVE-100-352574 Entryinfo Created: 03/23/2026 20:12 Changes: 03/23/2026 20:12 (77) Complete: 🔍 Cache ID: 99:9D9:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸